Global Patent Index - EP 1204205 A3

EP 1204205 A3 20040107 - Lattice filter with ripple in passing band eliminated and with passing band widened

Title (en)

Lattice filter with ripple in passing band eliminated and with passing band widened

Title (de)

Gitterfilter mit eliminierter Welligkeit im Durchlassband und mit verbreitertem Durchlassband

Title (fr)

Filtre en treillis à ondulation éliminée dans la bande passante et à bande passante élargie

Publication

EP 1204205 A3 20040107 (EN)

Application

EP 01309319 A 20011102

Priority

JP 2000342370 A 20001106

Abstract (en)

[origin: EP1204205A2] Even when a difference between the series resonance frequency and the parallel resonance frequency of each resonator cannot be made large, the passing band will be rendered capable of being widened without causing any ripple in the passing band. <??>One of each of the first resonator (5) and the first inductance element (7) is connected to each other in series, and is inserted between the first input end (1) and the first output end (2) while the other of each of the first resonator (5) and the first inductance element (7) is connected to each other in series, and is inserted between the second input end (3) and the second output end (4); and one of each of the second resonator (6) and the second inductance element (8) is connected to each other in series and is inserted between the first input end (1) and the second output end (4) while the other of each of the second resonator (6) and the second inductance element (8) is connected to each other in series and is inserted between the second input end (3) and the first output end (2), whereby the parallel resonance frequency of the second resonator (6) is caused to substantially coincide with the series resonance frequency based on the first resonator (5) and the first inductance (7). <IMAGE>

IPC 1-7

H03H 9/58; H03H 9/54

IPC 8 full level

H03H 9/64 (2006.01); H03H 9/00 (2006.01); H03H 9/54 (2006.01); H03H 9/58 (2006.01)

CPC (source: EP US)

H03H 9/0095 (2013.01 - EP US); H03H 9/542 (2013.01 - EP US)

Citation (search report)

Designated contracting state (EPC)

AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE TR

DOCDB simple family (publication)

EP 1204205 A2 20020508; EP 1204205 A3 20040107; JP 2002152008 A 20020524; US 2002053957 A1 20020509; US 6624725 B2 20030923

DOCDB simple family (application)

EP 01309319 A 20011102; JP 2000342370 A 20001106; US 357901 A 20011102